exam Maths Puzzle Numerical Ability

Please help me solve this problem. It says to add and simplify: 8/3x+7/6x^2

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exam Other Question

Subtract. Write your answer in simplest form.

((y-2)/(y+3))-((y)/(2y+6))=????????

This is another one that is giving me a migrane. I need some serious help, please!! Find the standard deviation.
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